Breathable Shoe Sole Using Tesla Valve for Unidirectional Air Flow
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Solution Overview
Problem
Traditional breathable sports shoes face issues with air permeability at the sole area, leading to frequent malfunctioning of single-way valves due to dust and moisture ingress, which affects the reliability and longevity of the breathable design.
Innovation Solution
A breathable sole design featuring a midsole with an air chamber, a Tesla valve-based single-way air outlet channel, and an air-guiding channel, integrated with a resilient ETPU midsole and outsole, which allows for efficient air discharge and moisture expulsion without movable parts, using a labyrinth pattern for air collection and a dome structure for easy air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single-way valves with movable parts are used for air discharge, then air permeability is improved, but reliability deteriorates due to frequent malfunctioning from dust and moisture ingress
Solution Approach 1:
The patent replaces the mechanical single-way valve with movable parts with a Tesla valve structure that uses fluid dynamics principles. The Tesla valve employs a series of serpentine channels with varying cross-sections that allow air to pass in one direction while creating high resistance to reverse flow, eliminating the need for movable components that can malfunction from dust and moisture ingress.
Solution Approach 2:
The patent changes the flow resistance parameters along the Tesla valve channels. The channel cross-sectional area and orientation are varied along the flow path to create asymmetric flow characteristics - low resistance for forward flow and high resistance for reverse flow. This parameter variation enables the single-way valve function without mechanical moving parts.
2Productivity
If single-way valves operate frequently during sports activities, then air discharge function is maintained, but durability deteriorates due to aging and malfunctioning of movable parts
Solution Approach 1:
The patent eliminates the mechanical valve system entirely and replaces it with a passive Tesla valve structure that relies on fluid dynamics. This substitution removes the movable parts that age and malfunction, enabling the system to withstand frequent operation during sports activities without degradation in performance or lifespan.
Solution Approach 2:
The patent uses a simple, integrally molded Tesla valve structure that can be easily manufactured and replaced if needed. The valve is formed as part of the sole structure through injection molding, making it a cost-effective, maintenance-free component that doesn't require complex assembly or disassembly during frequent use.
3Adaptability or versatility
If single-way valves are exposed to dust and moisture during ground contact, then air discharge function is maintained, but functionality deteriorates due to blockage of movable parts
Solution Approach 1:
The patent replaces the mechanical valve with a Tesla valve that has no internal movable parts that can be blocked. The serpentine channel structure with varying cross-sections maintains its single-way valve function regardless of dust or moisture presence, as the flow control is achieved through geometric design rather than mechanical components.
Solution Approach 2:
The Tesla valve structure acts as an intermediary that allows air to pass while preventing reverse flow through its geometric design. The channel configuration creates a natural barrier to reverse flow without requiring tight seals or movable parts that could be compromised by dust and moisture contamination.
4Adaptability or versatility
If air outlet holes are provided in the outsole, then air discharge is enabled, but dust and moisture ingress into the valve increases
Solution Approach 1:
The patent replaces the mechanical valve with a Tesla valve structure that eliminates the need for tight seals and movable parts at the air outlet. The serpentine channel design inherently prevents reverse flow without requiring tight closures, reducing the risk of dust and moisture ingress while maintaining air discharge capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the longevity and reliability of breathable shoes by preventing reverse air flow, reducing foot odor, and maintaining efficient air discharge and moisture expulsion during walking, with a production method that is efficient and cost-effective.
Implementation Method 1
the single-way air outlet channel is a Tesla valve which has an end connecting to a front position of the air chamber and another end provided with an air outlet hole penetrating the upper surface of the midsole; the single-way air outlet channel imposes a higher resistance against air flowing from the air outlet hole to the air chamber than air flowing from the air chamber to the air outlet hole
Implementation Method 2
the dispersed air-collecting channel comprises annular channels which radiate concentrically and form a labyrinth pattern; the air-guiding channel is connected with the annular channels
Implementation Method 3
the air chamber is provided at a heel position of the midsole, and is a dome structure subsiding from an outer edge of the air chamber to a center of the air chamber
Implementation Method 4
the midsole is made of highly resilient materials; the midsole is integrally formed by expanded thermoplastic polyurethane (ETPU) pellets
Data Source
AI summary
A breathable sole, including a midsole and an outsole; a bottom surface of the midsole has an air chamber, an air inlet channel and a single-way air outlet channel; the air chamber is provided at a heel position; the air inlet channel comprises a dispersed air-collecting channel and an air-guiding channel; the dispersed air-collecting channel is provided at the sole and is provided with air inlet holes; the air-guiding channel is connected with a rear position of the dispersed air-collecting channel and the air chamber; the single-way air outlet channel is a Tesla Valve which has an end connecting to a front position of the air chamber, and has another end provided with an air outlet hole penetrating the upper surface of midsole; the single-way air outlet channel imposes a higher resistance against air flowing from the air outlet hole to the air chamber.